Enhancing lavender (Lavandula angustifolia Mill.) propagation in vertical farming system: Investigating the impact of LED red-to-blue ratios and subsequent post-potting growth dynamics

This study aims to examine the influence of red-to-blue (R:B) LED light ratios on the propagation of Lavandula angustifolia within a vertical farming system. Additionally, it seeks to evaluate the persistent effects of LED lighting treatments on post-potting development in a glasshouse.

The objective of this study is to assess how different R:B LED light ratios impact Lavandula angustifolia propagation in a vertical farming system and to analyze the enduring effects of these lighting treatments during the post-potting development stage in a glasshouse.

The study consists of two phases. In the initial phase, an analysis was conducted on root emergence, root and shoot biomass, chlorophyll content, and flower bud emergence. Two LED treatments, labeled L1 and L2, were employed, with specific R:B ratios (7:1 and 9:1) and light intensities set at 140 µmol m−2 s−1 and 100 µmol m−2 s−1, respectively. Correlation and regression analyses were performed to understand the relationships among the various parameters.

In Phase One, the L1 and L2 LED treatments significantly enhanced root emergence and biomass. Notably, the R:B ratios of 7:1 and 9:1, with corresponding intensities of 140 µmol m−2 s−1 and 100 µmol m−2 s−1, demonstrated substantial improvements. In the subsequent glasshouse phase, plants previously treated with L1 exhibited superior plant height and shoot biomass.

The findings of this study highlight the intricate relationships among different parameters, providing valuable insights for lavender cultivation practices. The positive outcomes, particularly observed in the L1 treatment, emphasize the potential of vertical farming systems and LED lighting in optimizing lavender growth dynamics. This study underscores the importance of specific R:B ratios, contributing to sustainable propagation strategies, and acknowledges the space-efficient nature of vertical farming systems.